See and hear the estimated force on your knees as you walk or run.

Evaluate different running styles, surfaces, routes and even what difference your shoes can have on the forces on your knees.

I made this for myself when I was recovering from knee surgery, but it can be used by anyone interested in how they are impacting their knees.

This app recognizes step based activity and records the maximum G force during each step and uses that to estimate the knee force.

Set a G force threshold so the app can warn you if you exceed a certain value. This is great for live feedback when you are running and walking to correct your speed or style and avoid overloading your knees.

Uses voice based feedback so you can put your phone in your pocket or strap to your arm while walking or running. Also counts your steps and lots of other useful data to those exercising. You can mix your music with the spoken feedback,

What's New

Version 1.2

update to latest iOS


Ian Pendlebury
35.3 MB
Health & Fitness
Requires iOS 8.0 or later. Compatible with iPhone, iPad 2 Wi-Fi + 3G, iPad Wi‑Fi + Cellular (3rd generation), iPad Wi-Fi + Cellular (4th generation), iPad mini Wi-Fi + Cellular, iPad Air Wi-Fi + Cellular, iPad mini 2 Wi-Fi + Cellular, iPad Air 2 Wi-Fi + Cellular, iPad mini 3 Wi-Fi + Cellular, iPad mini 4 Wi-Fi + Cellular, 12.9-inch iPad Pro Wi-Fi + Cellular, 9.7-inch iPad Pro Wi-Fi + Cellular, iPad Wi-Fi + Cellular (5th generation), 12.9-inch iPad Pro Wi‑Fi + Cellular (2nd generation), 10.5-inch iPad Pro Wi‑Fi + Cellular, iPad Wi-Fi + Cellular (6th generation), iPad Pro (11-inch), and iPad Pro (12.9-inch) (3rd generation).
Age Rating
Rated 4+
This app may use your location even when it isn't open, which can decrease battery life.
© TripWare


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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